<template>
	<div class="login_container">
		<div class="login_box">
			<!--头像区域-->
			<div class="avatar_box">
				<img src="../assets/logo.png" alt="">
			</div>
			<!--登录表单区域-->
			<el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
				<!--姓名区域-->
				<el-form-item prop="username">
					<el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
				</el-form-item>
				<!--密码区域-->
				<el-form-item prop="password">
					<el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
				</el-form-item>
				<!--按钮区域-->
				<el-form-item class="btns">
					<el-button type="primary" @click="login">登录</el-button>
					<el-button type="info" @click="resetLoginFrom">重置</el-button>
				</el-form-item>
			</el-form>
		</div>
	</div>
</template>

<script>
	export default{
		data(){
			return {
				//这是登录表单的数据绑定对象
				loginForm: {
					username: 'admin',
					password: '123456'
				},
				//这是表单的验证规则对象
				loginFormRules: {
					//验证用户名是否合法
					username: [
						{ required: true, message: '请输入登录名称', trigger: 'blur' },
						{ min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
					],
					//验证密码是否合法
					password: [
						{ required: true, message: '请输入登录密码', trigger: 'blur' },
						{ min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
					],
				}
			};
        },
		methods: {
			//点击重置登录表单
			resetLoginFrom() {
				this.$refs.loginFormRef.resetFields();
				
			},
			//登录预验证
			login() {
				this.$refs.loginFormRef.validate(async valid => {
					if(!valid) return;
					const {data: res} = await this.$http.post('login', this.loginForm);
					if(res.meta.status !== 200) return this.$message.error("登录失败！");
					this.$message.success("登录成功！");
					//1.登录成功之后的token，保存到客户端的sessionStorage中
					//  1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
					//  1.2 token只应在当前网站打开期间生效，所以将token保存在 sessionStorage中
					window.sessionStorage.setItem('token', res.data.token);
					//2. 通过编程式导航跳转到后台主页， 路由地址是 /home
					this.$router.push('/home');
				}); 
			}
		}
	}; 
</script>

<style lang="less" scoped>
.login_container {
	background: #2b4b6b;
	height: 100%;

	
.login_box {
	width:450px;
	height: 300px;
	background-color: #fff;
	border-radius: 3px;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	
	.avatar_box{
		height: 130px;
		width: 130px;
		border: 1px solid #eee;
		border-radius: 50%;
		padding: 10px;
		box-shadow: 0 0 10px #ddd;
		position: absolute;
		left: 50%;
		transform: translate(-50%, -50%);
		background-color: #fff;
		img{
			width: 100%;
			height: 100%;
			border-radius: 50%;
			background-color: #eee;
		}
	}
}	
.login_form {
    position: absolute;
    bottom: 0;
	width: 100%;
	padding: 0 20px;
	box-sizing: border-box;
}

.btns {
	display: flex;
	justify-content: flex-end;
}
	
}
</style>
